Inside bracing is the best option.
The pinholes might be from galvanic corrosion. How is the roof built? Is there steel involved? Two different metals (aluminum and steel) will cause galvanic corrosion when moisture is present and give you the pin holes. Check the HILO Forum for similar issues. Even if not, the pin holes are from moisture under the aluminum roof. You have issues.
Simply use the Eternabond tape over each hole. Issues are that most of the holes are not visible from the outside, only from inside when the light shines through, but you'd need to remove the ceiling to see this. If you have holes then yo have water, so ceiling probably needs to come out. Start digging it out until you find no more wet, then dig a little more. so, for a one foot circle of wet you would maybe dig out a 1.5 foot circle. Lucky if it is that small.
Then cover all with the rubber roof coating. re-add the rubber roof coating every 2 years, or touch up the problem areas more often.
Lap sealant every year on seams.
